No, its not for Yoga bro.
The reflective mat is an important accessory and it's important to position the mat correctly. The laser optics need a reflective surface to facilitate the greatest accuracy, and the mat allows FLEX to work best no matter the gym flooring. In lieu of using the mat, you could also paint sections of your floor.
The mat appears durable enough and at 4ft x 1ft (120cm x 32cm) and 14 ounces (400 grams), it’s smaller than a regular sized towel, and just a touch bulkier. Overall, it rolls to take up about the same amount of space and easily fits into a gym bag.
It is important to setup the mat so that during the path of lift, the FLEX device is roughly over the centre of the mat. See below images for placement from the rack or on the floor.